Time- and space-resolved measurements of Ar(1s5) metastable density in a microplasma using diode laser absorption spectroscopy
| Autor: | Nader Sadeghi, Demetre J. Economou, Vincent M. Donnelly, Sergey G. Belostotskiy, Tola Ouk |
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| Přispěvatelé: | LAsers, Molécules et Environnement (LAME-LIPhy), Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Acoustics and Ultrasonics
Absorption spectroscopy chemistry.chemical_element 01 natural sciences 010305 fluids & plasmas law.invention law Physics::Plasma Physics [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] Metastability 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Dissociative recombination 010302 applied physics [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] Argon Microplasma Chemistry Plasma Condensed Matter Physics Laser Surfaces Coatings and Films Electronic Optical and Magnetic Materials Afterglow Physics::Space Physics Atomic physics |
| Zdroj: | Journal of Physics D: Applied Physics Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44, pp.5202. ⟨10.1088/0022-3727/44/14/145202⟩ |
| ISSN: | 0022-3727 1361-6463 |
| DOI: | 10.1088/0022-3727/44/14/145202⟩ |
| Popis: | Time- and space-resolved measurements of Ar(1s5) metastable (Ar*) density were carried out in a pulsed dc argon microplasma discharge, using diode laser absorption spectroscopy. The temporal behaviour of metastable density after discharge turn off (in the afterglow) depended on their spatial location in the microplasma. In the early afterglow, the Ar* density decayed monotonically with time in the region around the sheath edge, while in the bulk plasma the Ar* density showed a maximum with time. This behaviour was attributed to electron–ion dissociative recombination. Later in the afterglow, the Ar* decay was everywhere monotonic with time, mainly due to three-body collisional quenching by ground state argon atoms. The time evolution of the Ar* density in the afterglow predicted by a kinetic model is in good agreement with the experimental measurements. |
| Databáze: | OpenAIRE |
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